A$)$ Two couples act on the frame. If the resultant moment created by the couples is to be zero, determine the distance $d$ between the $40$ lb couple forces. $(3$ marks$)$

$=-40cos30=-34\mathrm{.}641b$

$M=10sin30=201$buarr

$M=Fd$

$M_A=$

$M=0$

Ther ar tus cauples

one na the unkniwn $d$ to determini

$0$

$3$

B$)$ Refer to the frame above $($question $1$A$).$ If the distance $d$ is $4$ ft $,$ find the resultant moment about point B$.(3$ marks$)$

$=+34*64(4)+60(\frac{4}{5})(3)$

Sum the moments of the two caples